I think the OpenBitcoinTrader project wants to implement something similar?

I also implemented a trading window in my app...

Maybe just go with phonegap. That would give you an android, web etc implementation. And when apple finally allows btc on the iphone, it's added in an instant, too...

Wouldn't it be easier to start with the Intersango sources, or so?

I'm thinking about an exchange, too, and already did some work. But I'm no security expert and I'm not allowed to host such a service in my country, so this project is stalled for now...

Ist da ein exchange dabei, dessen API man implementieren sollte?

It happens quite often. Problem is, to get the money back to the other exchange. Might work best via fiat, if you know a good payment service (I do not... )...

Every exchange API implementation has a method

getFeeForOrder()

https://github.com/ReAzem/cryptocoin-tradelib/blob/master/core/src/de/andreas_rueckert/trade/site/TradeSite.java

and you can pass an order (before you actually trade) to get an hopefully acurrate price for this order execution.

But things are actually quite complicated in some cases and my code does not handle every situation 100% accurate, because I implement stuff, as I actually use it.

One problem are the fees on some exchanges, that change with the traded volume of the user. So you trade x coins and you pay fee a for the first x/2 coins, but fee b (usually lower then a) for the other x/2 coins.

Another problem (mainly for the bots) are fees, that are paid in a different currency than the actually traded currency. So you withdraw usd from an exchange and pay x euro as the fee. You have to convert this fee to figure, if the trade would be profitable, but sometimes the conversion rates are unknown etc.

Every exchange, that has complex fees should add a method, that returns the fee for an order. So an API implementation would just pass an order to the exchange and would get the fee as a return. But most exchanges don't do it yet...

So it's a moving target for every bot coder, I guess.

If anyone has a perfect solution, please post it here! Thanks!!!

It's important for bots, that do arbitrage with more than 1 exchange. They check rates on several exchanges and try to buy cheap on one exchange and sell the coins on another exchange.

Add a security expert for auditing etc.

gweedo, I solved my sign issue. The problem was actually the decimal separator of amounts and prices. I had used ',' before (i.e. 2,35), but btc-e stopped working with that. Now I use '.' (i.e. 2.35) and it works again. Had nothing to do with the encoding of the sign.

I played a bit with phonegap:



Also nice...

Same here...but when I ask question in the bitcoin IRC channels, or  so, they usually just respond like 'java must die'...

I also released some sources and do bot coding...(just for myself)...

https://github.com/ReAzem/cryptocoin-tradelib

Last time, he was seen here, was july 15th ... ?

AFAIK, there is actually an API method for withdrawal, but it's not public. There's also a checkbox to enable withdrawal for API keys, but you cannot use it. I've written some code, that parses the website, but it needs testing, and I have to deal with other features first.

Another java coder! I like you...

I have an implementation, that might be helpful for you:

https://github.com/ReAzem/cryptocoin-tradelib

I use it for bot stuff, like this one:

Ich arbeite mit Java. Falls das kein ko-Kriterium ist und Du evtl. Interesse an einer Zusammenarbeit hast, meld Dich doch mal...

Arbeitest Du mit nem Bot oder per Hand? (Ich interessier mich fürs Bot-Coden.)

The guys from the chatbox are hanging out there...

Channel ##trollbox on freenode IRC.